HFSPLUS_SB_NOBARRIER
if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
set_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
clear_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))